Super-capacitive carbon and method for its production

By constructing microporous-mesoporous channel structures through an oxidation-carbonization-activation process, the problems of low pore structure utilization and poor electrochemical performance of carbon materials in supercapacitors were solved, achieving high specific surface area and long lifespan capacitor performance.

CN117985714BActive Publication Date: 2026-06-02CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Application Number
CN202211327004.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-27
Publication Date
2026-06-02
Estimated Expiration
2042-10-27

AI Technical Summary

Technical Problem

Existing carbon materials for supercapacitors suffer from low pore structure utilization, high internal resistance, and surface heteroatoms that affect electrochemical performance, resulting in poor rate performance and long-cycle performance. Furthermore, their preparation processes are complex and costly.

Method used

By employing a combined process of oxidation-carbonization-primary activation-secondary activation, and controlling the oxidation process and alkali activation, a microporous-mesoporous ladder-type pore structure is constructed to encapsulate heteroatom functional groups, thereby improving the specific surface area and long-term stability.

Benefits of technology

It significantly improves the specific surface area and charge transport speed of carbon supercapacitors, extends the material's lifespan, reduces leakage current, and enhances long-cycle stability.

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Abstract

The application provides a supercapacitor carbon and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing petroleum coke and pitch uniformly to obtain a first material; then, carbonizing the first material under the condition of an oxygen-containing gas to obtain a second material; then, crushing the second material and mixing the second material with alkali to perform primary activation under an inert atmosphere to obtain a third material; then, washing and drying the third material, mixing the third material with pitch and alkali, and performing secondary activation under an inert atmosphere; finally, washing and drying to obtain the supercapacitor carbon. The supercapacitor carbon has mesopore-micropore two-stage pore channels, wherein the mesopore has a pore diameter of 2nm-5nm, and the micropore has a pore diameter of 0.4nm-2nm. The application realizes the short-range through-hole pore channel structure design of the petroleum-based porous material through a combined process, provides a large specific surface area for the formation of an effective double electric layer, guarantees the rapid transmission of electric charges, and significantly improves the long-period cycle stability of the material.
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